/**
* Copyright (c) 2011, Regents of the University of Colorado
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* Neither the name of the University of Colorado at Boulder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package clear.reader;

import java.io.FileInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import com.carrotsearch.hppc.ObjectIntOpenHashMap;
import com.carrotsearch.hppc.cursors.ObjectCursor;

/**
 * @author Jinho D. Choi
 * <b>Last update:</b> 8/2/2011
 */
public class ReaderXML
{
	/** Elements */
	static public final String READER = "reader";
	static public final String COLUMN = "column";
	
	/** Attributes */
	static public final String READER_FORMAT = "format";
	static public final String COLUMN_INDEX  = "index";
	static public final String COLUMN_TYPE   = "type";
	
	/** Values */
	static public final String FORMAT_RAW    = "raw";
	static public final String FORMAT_LINE   = "line";
	static public final String FORMAT_COLUMN = "column";
	
	public String                       s_format;
	public ObjectIntOpenHashMap<String> m_columns;
	
	public ReaderXML(String xmlFile)
	{
		DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();

		try
		{
			DocumentBuilder builder = dFactory.newDocumentBuilder();
			Document        doc     = builder.parse(new FileInputStream(xmlFile));
			
			init(doc);
		}
		catch (Exception e) {e.printStackTrace();}
	}
	
	public ReaderXML(Document doc)
	{
		try
		{
			init(doc);	
		}
		catch (Exception e) {e.printStackTrace();}
	}
	
	protected void init(Document doc) throws Exception
	{
		NodeList eList = doc.getElementsByTagName(READER);
		
		if (eList.getLength() <= 0)
		{
			System.err.println("Error: reader format not defined");
			return;
		}
		
		Element eReader = (Element)eList.item(0);
		s_format = eReader.getAttribute(READER_FORMAT);
		
		if (s_format.equals(FORMAT_COLUMN))
		{
			NodeList eColumns = eReader.getElementsByTagName(COLUMN);
			Element  eColumn;
			int      index;
			String   type;
			
			m_columns = new ObjectIntOpenHashMap<String>();
			
			for (int i=0; i<eColumns.getLength(); i++)
			{
				eColumn = (Element)eColumns.item(i);
				index   = Integer.parseInt(eColumn.getAttribute(COLUMN_INDEX));
				type    = eColumn.getAttribute(COLUMN_TYPE);
				
				m_columns.put(type, index);
			}
		}
		else if (!s_format.matches(FORMAT_RAW+"|"+FORMAT_LINE))
			System.err.println("Error: unknown reader format '"+s_format+"'");
	}
	
	public void print()
	{
		System.out.println(s_format);
		
		if (m_columns != null)
		{
			for (ObjectCursor<String> cur : m_columns.keys())
				System.out.printf("%3d: %s\n", m_columns.get(cur.value), cur.value);
		}
	}
	
/*	static public void main(String[] args)
	{
		new ReaderXML(args[0]).print();
	}*/
}
